An outdoor socket is one of those small additions that dramatically improves how you use your garden, powering a lawnmower without an extension lead trailing through a door, running festoon lights, charging outdoor tools, or supplying an outbuilding. But outdoor electrical work carries rules that indoor work does not: specific cable types, stricter protection requirements, and, depending on how the supply is taken, a duty to notify the work under the Building Regulations.

This guide explains what is legally required, what it costs, and the best approach for different garden power scenarios.

Regulatory Requirements

In England, Part P makes three things notifiable: a new circuit, a replacement consumer unit, and work inside a special location, which means the zones around a bath or shower, or a room with a swimming pool or sauna heater.1 A garden is not a special location, so which side of the line your outdoor socket falls on depends on how it is fed. A new dedicated circuit run out from the consumer unit is notifiable. A socket spurred off an existing circuit is not, and it still has to meet BS 7671 in full, including everything in the protection section below.1

Where the work is notifiable, it must either be:

  1. Carried out by an electrician registered with a competent person scheme authorised by government (NICEIC, NAPIT or another authorised scheme), who can self-certify the work; or
  2. Notified to local authority Building Control before it starts, for inspection and a completion certificate, which typically costs about £250–£500 in council charges, depending on the council.

Wales, Scotland and Northern Ireland set their own rules on which electrical work has to be notified. In practice, almost all outdoor socket work is done by registered electricians. On completion you should receive a BS 7671 certificate: an Electrical Installation Certificate if a new circuit was installed, or a Minor Electrical Installation Works Certificate for an addition to an existing circuit.2

Do not be tempted to DIY outdoor socket work without certification. Uncertified notifiable work can complicate an insurance claim after an electrical fault or fire. When you come to sell the property, solicitors routinely request electrical certificates.

Protection Requirements: RCD is Mandatory

Every outdoor socket circuit must be protected by a 30 mA residual current device (RCD).3 This is a hard requirement under BS 7671 (Regulation 411.3.3). In most modern consumer units (fuse boards) fitted since around 2010, RCD protection is already provided by an RCBO or by the RCD protecting the relevant circuit. Your electrician will confirm this at the design stage.

In addition, sockets installed outdoors must be:

  • IP-rated for outdoor use: IP44 (splash-proof) is the usual minimum for a sheltered spot, and most outdoor sockets on sale are IP66 (dust-tight and protected against powerful water jets), the better choice near water features, hose points or on an exposed coastal wall.3
  • Suitable for outdoor use: standard indoor sockets are not acceptable even under cover.

Cable Types and Burial Depths

The cable run from the house to the outdoor socket is the most technically critical element.

RoutePermitted cable typeTypical depth
Buried in garden (no protection)6242Y twin + earth in 25 mm conduit is insufficient, must use 2.5 mm² SWA (steel wire armoured)Around 500 mm
Buried in garden under concrete / drive2.5 mm² SWA armoured cableAround 500 mm
Surface-run on exterior wall2.5 mm² singles in rigid conduit, or SWAN/A
Overhead (span under 3 m)2.5 mm² or 4 mm² aerial bundled cable on a catenary wireAt least 3.5 m above ground

These depths are common practice rather than figures fixed in BS 7671: the aim is to bury the cable deep enough to avoid damage from garden tools, and your electrician will set the depth for your site.3

SWA (steel wire armoured) cable is the standard for buried garden cable runs. The steel wire armour provides mechanical protection against garden forks and spades. For a single outdoor socket, 2.5 mm² 3-core SWA is almost always sufficient. SWA cable of that size costs roughly £2–£3 per metre supplied. Toolstation listed a 25 m coil of 2.5 mm² 3-core SWA at £53.99 including VAT in October 2026, about £2.16 per metre.4

The cable must be identifiable along its route, with cable marker tape or cable covers laid in the trench above it, and it helps to route it along a line that is unlikely to be disturbed (fence line, wall base). Draw a plan and keep it with the electrical certificate.

Cost Guide

ScenarioTypical cost (2026, inc. VAT)
Single outdoor socket, surface-run cable from nearest indoor socket£180–£300
Single outdoor socket, buried cable run (up to 10 m)£250–£450
Twin outdoor socket, buried cable (up to 10 m)£300–£550
Dedicated garden circuit from consumer unit, up to 20 m buried run£450–£800
Outbuilding supply (sub-panel, lighting + sockets)£800–£2,000

These prices include labour, materials (SWA cable, back box, outdoor socket, any conduit, fittings), and, where the work is notifiable, the Building Regulations compliance certificate issued on self-certification.

Garden Power Options Beyond Standard Sockets

Weatherproof Extension Columns

Free-standing socket columns (e.g. for a patio or decking area) can be fed by a buried SWA cable. They provide 2–4 socket positions at a convenient height and are rated for permanent outdoor installation. Supply-only cost: £80–£200.

Outbuilding Supply

A detached garage, workshop, or home office that requires multiple circuits or significant load (230 V power tools, an electric car charger) is best served by a dedicated SWA supply from the main consumer unit, with a small sub-panel (consumer unit) in the outbuilding providing separate circuits for lighting, sockets, and any specific equipment.

This is a larger project, expect £800–£2,000 for a typical garage/workshop, but correctly done it is much safer than multiple extension leads from the house and avoids the risk of nuisance tripping on a shared household circuit.

Low-Voltage Garden Lighting (12V)

Low-voltage garden lighting systems (transformer in the house, 12 V cable buried to outdoor fittings) still fall within Part P, which covers extra-low voltage installations in a garden, but they are not notifiable unless the work includes a new circuit from the consumer unit.1 That makes DIY installation of low-voltage path and patio lighting fed from an existing circuit legal, provided it is done safely. Bury the cable or run it in conduit where gardening will not damage it.

Solar-Powered Outdoor Lighting

Battery-backed solar lights require no electrical connection and no regulatory compliance. Quality solar garden lights (lithium battery, 4–8 hour runtime) range from £15–£80 per unit. For lighting applications that do not need mains reliability, solar is the simplest option.

Choosing an Electrician

For notifiable outdoor work, use an electrician registered with one of the competent person schemes authorised by government:

  • NICEIC: check registration at niceic.com. The scheme operator on the government list is Certsure, which trades as NICEIC, and which absorbed the old ELECSA brand, so an electrician still describing themselves as ELECSA-registered now sits under NICEIC.5
  • NAPIT, widely used by smaller contractors.
  • Others are authorised for domestic electrical work as well, including BESCA, Blue Flame Certification and OFTEC. The current list is published on gov.uk.5

Ask for a quotation that specifically includes the BS 7671 certificate and, for notifiable work, the Building Regulations compliance certificate from their scheme. A reputable electrician always includes this, if a contractor does not mention certification, treat this as a red flag.

Get at least two quotes for jobs over £400. Prices vary significantly by region: London and south-east England typically cost noticeably more than the Midlands and north of England for the same scope of work.

References (5)

Figures in this note were checked against the sources below on 6 October 2026. Superscript numbers in the text point to them. Every source the site cites, by topic.

  1. 1technicalvery strongMinistry of Housing, Communities and Local Government.RN-JYJ3I5The document that decides what electrical work a homeowner may legally do themselves, and the exact list of notifiable jobs. Regulation 12(6A), reproduced at paragraph 2.5, makes only three things notifiable: the installation of a new circuit, the replacement of a consumer unit, and any addition or alteration to existing circuits in a special location. Regulation 12(9) defines special location as, in a room containing a bath or shower, the zone extending vertically from finished floor level to 2.25 metres (or the shower head position if higher) and horizontally 600mm from the edge of the bath tub or shower tray. Paragraph 2.7 states that all other electrical installation work is not notifiable, namely additions and alterations to existing installations outside special locations, and replacements, repairs and maintenance anywhere. Paragraph 2.8 gives worked examples: a built-in cooker is not notifiable unless a new cooker circuit is needed, and connecting an electric gate or garage door to an existing isolator is not notifiable but running a new circuit from the consumer unit to that isolator is. Paragraph 2.2 confirms Part P reaches outdoor work including fixed garden lighting, pond pumps and outbuildings such as sheds, detached garages and domestic greenhouses. Notifiable work must be certified by self-certification by a registered competent person, third-party certification, or a building control body (paragraph 3.1), with the compliance certificate issued within 30 days (paragraph 3.4). Note that Approved Document P is a source of guidance rather than a ban: non-notifiable work still has to comply with BS 7671.
  2. 2technicalstrongNICEIC, guidance.RN-GUGEUBNICEIC's householder FAQ explains that a new circuit gets an Electrical Installation Certificate and an addition to an existing circuit, such as a new socket, a Minor Electrical Installation Works Certificate.
  3. 3technicalstrongNICEIC, guidance.RN-CKDHKENICEIC's homeowner guide to garden electrics: outdoor sockets must be RCD-protected, IP-rated for outdoor use, and fed by outdoor cable buried deep enough to avoid damage.
  4. 4technicalsupplier figureToolstation, guidance.RN-LZ7TLPToolstation product page for a 25 m coil of Pitacs 2.5 mm² 3-core steel wire armoured cable at £53.99 including VAT, about £2.16 per metre supplied.
  5. 5technicalvery strongMinistry of Housing, Communities and Local Government.RN-SAMO3MThe official list of competent person schemes whose members can self-certify certain building work instead of getting building regulations approval, published 4 April 2013 and last updated 12 March 2018. Named schemes with contact numbers include ATTMA, APHC, Assure Certification, Blue Flame Certification, the British Board of Agrement, BESCA, Capita Gas Registration and Ancillary Services trading as Gas Safe Register, CIGA, Certass, Certsure LLP trading as NICEIC, the Elmhurst Airtightness Scheme, Fensa Limited, HETAS Limited, NAPIT Registration Limited, the National Federation of Roofing Contractors trading as CompetentRoofer, and OFTEC. Two footnotes matter: the Gas Safe Register is not technically a competent person scheme although in practice its installers carry the same building regulations responsibilities, and Benchmark Certification Limited ceased to operate as a competent person scheme on 10 February 2017, becoming part of NAPIT Registration Limited that day. Installers joining an electrical scheme are added to the single electrical competent person register.

  1. Approved Document P: Electrical safety - Dwellings (2013 edition), HM Government, accessed 10 September 2026. assets.publishing.service.gov.uk

  2. The NICEIC Help Hub: FAQs for householders and landlords, NICEIC, accessed 30 September 2026. niceic.com

  3. Garden electrics guide: regulations and requirements, NICEIC, accessed 30 September 2026. niceic.com

  4. Pitacs SWA Armoured Cable 2.5mm2 3 Core Coil, Toolstation, accessed 6 October 2026. toolstation.com

  5. Competent person scheme: current schemes and how schemes are authorised, Ministry of Housing, Communities and Local Government (GOV.UK), accessed 10 September 2026. gov.uk